AspectJ in Action: Practical Aspect-Oriented Programming - download pdf or read online

By Ramnivas Laddad

ISBN-10: 1930110936

ISBN-13: 9781930110939

A software program approach is the conclusion of a suite of matters. one of many primary premises of object-oriented programming is that every obstacle may be carried out as a separate module. despite the fact that, there are specific system-wide matters, resembling logging, safety, functionality, and so on, that regularly must be addressed in lots of, if now not the entire modules. for this reason, the code to address those system-wide matters will be jumbled in with the center good judgment of a big variety of modules, leading to reduce productiveness, terrible caliber, and structures which are difficult to conform. Aspect-oriented programming overcomes those difficulties via modularizing the system-wide matters.

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Extra info for AspectJ in Action: Practical Aspect-Oriented Programming

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The weaving rules are expressed here in natural language. The programmatic equivalent of these rules go into an aspect: Logging Aspect: Rule 1: Create a logger object. Rule 2: Log the beginning of each public operation. Rule 3: Log the completion of each public operation. info Benefits of AOP 27 When the compiler or the VM combines SomeBusinessClass, which contains the core logic, with the aspect containing the weaving rules, the result is an implementation that is equivalent to the following: public class SomeBusinessClass extends OtherBusinessClass { ...

Clients who use the authorization services through the interface are for the most part oblivious to the exact implementation they are using. Any changes to the implementation they are using will not require any changes to the clients themselves. Likewise, replacing one authorization implementation with another is just a matter of instantiating the right kind of implementation. The result is that one authorization implementation can be switched with another with little or no change to the individual client modules.

1: All the data and method members, method parameters, and code to perform crosscutting—the ancillary concerns— have been removed and only the core business logic remains. Now let’s apply a crosscutting concern, using logging as an example. Let’s assume that we have the following interface to abstract the logging implementation. The first step is to create an appropriate implementation of this interface so that calls to it can be woven into SomeBusinessClass: public interface Logger { public void log(String message); } Now that we have the logging class, we need to create the weaving rules that tell the system what to do with it.

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AspectJ in Action: Practical Aspect-Oriented Programming by Ramnivas Laddad


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